EKTF6708 datasheet(118/158 Pages) EMC

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eKTF6708

8-Bit Microcontroller

108



IC Product Specification (V1.2) 03.12.2020

(This specification is subject to change without prior notice)

The following explains the functions of each block in the above figures as SPI carries out

communication with the depicted signals:



P51/SI: Serial Data In



P52/SO: Serial Data Out



P53/SCK: Serial Clock



P50//SS: /Slave Select (Option). This pin (/SS) may be required during Slave mode.



RBF: Set by Buffer Full Detector



Buffer Full Detector: Set to 1 when an 8-bit shifting is completed.



SSE: Load the data in SPIS register, and begin shifting. The SSE bit will be kept in

“1” if the communication is still undergoing. This flag must be cleared as shifting is

completed. You can determine if the next write attempt is available.



SPIS reg.: Shifting byte in and out. The MSB is shifted first. Both the SPIR and the

SPIW registers are shifted at the same time. Once data is written, SPIS starts

transmitting/receiving. The received data will be moved to the SPIR register as the

shifting of the 8-bit data is completed. The RBF (Read Buffer Full) flag and the SPISF

(SPI Interrupt) flag are then set.



SPIR reg.: Read buffer. The buffer is updated as the 8-bit shifting is completed. The

data must be read before the next reception is completed. The RBF flag is cleared as

the SPIR register reads.



SPIW reg.: Write buffer. The buffer will deny any attempts to write until the 8-bit

shifting is completed.



SBRS2~SBRS0: Programming of the clock frequency/rates and sources.



Clock Select: Select either the internal or the external clock as shifting clock.



Edge Select: Select the appropriate clock edges by programming the CES bit

6.10.3 SPI Signal and Pin Description

The detailed functions of the four pins, SI, SO, SCK, and /SS are as follows:

 P52/SI/TPA2:



Serial Data In



Receive sequentially, the Most Significant Bit (MSB) first, Least Significant Bit (LSB)

last.



Defined as high-impedance if not selected.

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